基于MMC的轻型直流输电系统控制装置的研究与实现
发布时间：2018-12-06 14:31
【摘要】：近年来,新能源发电得到了迅速发展,但具有分散性、小型化和远离主电网等特点,基于电压源换流器的轻型高压直流输电系统(、Voltage Source Converter, High Voltage Direct Current transmission, VSC-HVDC)可以非常有效地将这些分散电源进行并网接入。传统的VSC-HVDC输电系统采用低电平VSC技术,不能满足HVDC输电系统的高电压等级和大容量的要求,而且具有较高的开关频率、输出电压谐波大、串联器件存在动态均压等问题。 模块化多电平换流器(modular multilevel converter, MMC)不仅能满足HVDC输电系统的高电压等级和大容量的要求,而且具有相对较低的开关频率、容易实现冗余控制、分布电容式能量存储、输出电压谐波含量少、具有公共直流母线等优点,非常适用于HVDC输电系统。 本文首先对模块化多电平换流器的拓扑结构、工作原理、数学模型进行了详细的分析说明,并介绍了几种适用于MMC的调制方式。针对模块化多电平换流器,提出了基于系统级、装置级两个层面上的控制策略,结合优化的载波移相调制方式通过PSCAD/EMTDC仿真软件进行了仿真验证,验证了其可行性。 通过对MMC控制装置系统的硬件和软件需求分析,提出了一种主从式架构控制装置系统,具有线配置模式、图形化显示、使用光纤总数少、子模块控制器的智能型和独立性高等优点。对于MMC控制装置的通信问题,设计了DMA通信方式和基于FPGA的光纤通信,实现了三级控制器间的高速通信。最后,对部分控制装置系统进行了实验调试分析,给出了硬件实物图。
[Abstract]:In recent years, new energy generation has been developed rapidly, but it has the characteristics of dispersion, miniaturization and distance from the main power grid. The (, Voltage Source Converter, High Voltage Direct Current transmission, of HVDC system is based on voltage source converter. VSC-HVDC) can very effectively connect these decentralized power sources to the network. The traditional VSC-HVDC transmission system adopts low level VSC technology, which can not meet the requirements of high voltage level and large capacity of HVDC transmission system. It also has high switching frequency, high output voltage harmonic, dynamic voltage sharing of series devices, and so on. The modularized multilevel converter (modular multilevel converter, MMC) can not only meet the requirements of high voltage level and large capacity of HVDC transmission system, but also have relatively low switching frequency, easy to realize redundant control and distributed capacitive energy storage. The output voltage has less harmonic content and has the advantages of common DC bus, so it is very suitable for HVDC transmission system. In this paper, the topology, working principle and mathematical model of the modularized multilevel converter are analyzed in detail, and several modulation methods suitable for MMC are introduced. Aiming at the modularized multilevel converter, a control strategy based on system level and device level is proposed, and the feasibility is verified by PSCAD/EMTDC simulation software combined with the optimized carrier phase shift modulation. By analyzing the hardware and software requirements of MMC control device system, a master-slave architecture control device system is proposed, which has line configuration mode, graphical display, and less total number of optical fibers. The submodule controller has the advantages of intelligence and high independence. For the communication problem of MMC control device, the DMA communication mode and the optical fiber communication based on FPGA are designed, and the high speed communication between the three level controllers is realized. Finally, the experimental debugging and analysis of part of the control device system are carried out, and the hardware object diagram is given.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM721.1
本文编号：2366176
[Abstract]:In recent years, new energy generation has been developed rapidly, but it has the characteristics of dispersion, miniaturization and distance from the main power grid. The (, Voltage Source Converter, High Voltage Direct Current transmission, of HVDC system is based on voltage source converter. VSC-HVDC) can very effectively connect these decentralized power sources to the network. The traditional VSC-HVDC transmission system adopts low level VSC technology, which can not meet the requirements of high voltage level and large capacity of HVDC transmission system. It also has high switching frequency, high output voltage harmonic, dynamic voltage sharing of series devices, and so on. The modularized multilevel converter (modular multilevel converter, MMC) can not only meet the requirements of high voltage level and large capacity of HVDC transmission system, but also have relatively low switching frequency, easy to realize redundant control and distributed capacitive energy storage. The output voltage has less harmonic content and has the advantages of common DC bus, so it is very suitable for HVDC transmission system. In this paper, the topology, working principle and mathematical model of the modularized multilevel converter are analyzed in detail, and several modulation methods suitable for MMC are introduced. Aiming at the modularized multilevel converter, a control strategy based on system level and device level is proposed, and the feasibility is verified by PSCAD/EMTDC simulation software combined with the optimized carrier phase shift modulation. By analyzing the hardware and software requirements of MMC control device system, a master-slave architecture control device system is proposed, which has line configuration mode, graphical display, and less total number of optical fibers. The submodule controller has the advantages of intelligence and high independence. For the communication problem of MMC control device, the DMA communication mode and the optical fiber communication based on FPGA are designed, and the high speed communication between the three level controllers is realized. Finally, the experimental debugging and analysis of part of the control device system are carried out, and the hardware object diagram is given.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM721.1
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